Transit concrete mixer



Sept. 3, 1935. H, P. PARIS TRANSIT CONCRETE MIXER 6 Sheets-Sheet :1

Filed Nov. 13, 1928 lNVENTOR o Hug/zRPa rI'S BY 6 ATTORNEY Sept. 3,1935. P A 2,013,360

TRANSIT CONCRETE MIXER Filed Nov. 15, 1928 6 Sheets-Sheet 2 lNVENTORATTO EY J Sept. 3, 1935. H, p PARls 2,013,360

TRANS IT CONCRETE MIXER Filed Nov. 13, 1928 6Sheets Sheet 3 INVENTORVZ/g'fi RPar/S ATTbRNEY Sept. 3, 1935. H R PAR- 2,013,360

TRANSIT CONCRETE MIXER Filed Nov. 15; 1928 6 Sheets-Sheet 4 iNVENTORfiag Par/s ATTOR EY Sept. 3, 1935. H PA 2,013,360

TRANSIT CONCRETE MIXER Filed Nov. 13, 1928 6 Sheets-Sheet 5 INVENTOR 2 ZATTORNEY Sept. 3, 1935. P PARIS 2,013,360

TRANSIT CONCRETE MIXER Filed Nov. 13, 1928 6 Sheets-Sheet 6 6 a 0mm m 1r Y 8 mad .M. s: 2 MA A I \r. 1 W Y atented Sept. 3, 19 35 iTED s'l''rss PATENT OFFICE ments, to Paris Transit Mixer Seattle, Wash, acorporation oi Washington Application November 13, 1928, Serial No.319,067

3 Claims.

This invention relates to concrete mixers, more particularly of thetransit type, and aims primarily to provide a concrete mixer wherein theaggregates are intimately intermixed by slump action both laterally andlongitudinally whereby a. uniform mix is obtained and the resultantproduct has a high breaking strength.

I contemplated by the present invention is a concrete mixer embodying asupporting frame; a voluble wobbling mixing shell cradled upon saidframe; means for driving said shell; means for charging said shell;means for dumping the mix; and'water supply means for the aggregates,all of which are important objects of the invention and are to becorrelated in the broad aim of enhancing the emciency of the mixer forgeneral use.

The above, and additional objects which will hereinafter be morespecifically treated, are attained by such means as are shown in theaccompanying drawings, described in the following specification and thenmore clearly pointed out in the claims, which are appended hereto,

' and form a part of this application.

25 With reference to the drawings in which there are illustrated severalembodiments of the invention, and throughout the several views of whichlike characters of reference designate similar parts.

Figure 1 is a side elevation of a transit concrete mixer comprehended bythe present invention.

Fig. 2 is an end elevation of the same, certain parts being in sectionand certain other parts broken away for clarity of illustration.

Fig. 3 is a fragmentary plan view thereof.

Fig. 4 is a diagrammatic transverse view of the mixing shellillustrating the manner of reinforcing same. t

Fig. 5 is a plan view of a slightly modified t of transit mixer.

Fig. 6 is a vertical transverse section taken through 6-4 of Fig. 5.

Fig. 7 is a side elevation thereof.

Fig. 8 is a diagrammatic end view of the samein wherein approximatelytwo-thirds of thevolubroken away and certain other parts being shown insection.

Before taking up the detailed description of the drawings, a generalexposition of the specific purposes, features, and functions of thetransit 5 concrete mixer evolved by the present invention will beundertaken. Heretofore, considerable difflculty has been experiencedinkeeping the interior of concrete mixer shells clear of hardenedconcrete, due primarily to the numerous bafile 10 plates commonlyemployed and required in such shells to distribute and mix theaggregate, which baflle plates also function to retard and'impededumping of the mixed aggregates. Further objections and disadvantages ofthe transit mixture heretofore in use are: the length of their mixingshells and their mode of construction, which entailed and necessitatedthe employment .of trucks having excessively long wheel bases; renderedthe charging of such mixing shells extremely dinicult; permittedutilization of approximately only one-third of the volumetric capacityof the mixing shells; precluded proper and efilcient distribution ofwater to the aggregates; lacked adaptability or capability for mixingstill or relatively dry concrete due to the fact that the same becomestacky and lumpy and adheres to the interior baffles or blades of themixing shells thus effectually preventing clean dumping of the mixedaggregates; and the fact that the maximum charges of said mixing shellsare too small for all practical and profitable purposes. Therefore, aprimary object of this invention is to obviate the objections anddisadvantages of the transit mixers now in general use. Another primaryobject is the provision of a transit mixer of novel shape andconstruction, wherein no baflle plates, blades or other interiorobstructions of any kind are employed, which fact permits and insures ofa clean and complete discharge of the mixed aggregates and precludespossibility or probability of any corrosion occurring within the mixingshell. Another primary object is the provision of a compact andrelatively light transit mixer which may be mounted'upon a truck havinga relatively short wheel base thus materially increasing the maneuveringrange and effectiveness of the unit. Another primary objectis theprovision of a transit mixer which may be rapidly and readily chargedwith aggregates and wherefrom the mixed aggregates are expeditiously andreadily dumped without the use of complicated and costly hoistingdevices. Another primary object is to provide a transit mixeraggregates.

metric capacity of its mixing shell is efiectively utilized duringmixing of the aggregates, thus materially increasing the size of thecharges in each and every instance and in consequence thereof theearningcapacity of 'the unit. Another primary object is the provision ofa transit mixer especially designed and readily adaptable for mixingrelatively dry aggregates and for completely and rapidly discharging thesame when mixed. Another primary object is the provision of a transitmixer wherein the water is properly and uniformly distributed or sprayedupon the Another primary object is the pro-. vision of a transit mixerwherein the aggregates due to the shape of the mixing shell and itsrotating and wobbling movements are intimately intermixed in a mannerwhich approximates very closely the mixing of aggregates by the shovelmethod.

Beginning the more detailed description by reference to the accompanyingdrawings, the numeral ll designates atransversely disposed mixing shellor chamber, which is polygonal in cross-section, and which for purposesof the present disclosure is preferably illustrated and hereinafterdescribed as being of hexagonal formation. The shell II is closed at itsends and to provide for charging of the same with aggregates and for thedischarging or dumping the mix I prefer to utilize one of the sides ofsuch shell as a door i2, which is hinged as at E3 and when closed issecured by latches l6. A small gate l6 slidably disposed in guides I7 ismounted upon the door IE to permit of the discharge of relatively smallquantities of the mixed aggregates, asis often found desirable.

Rigidly secured and eccentrically mounted upon the ends of the mixingshell i l are annular journals orraceways l9 and 20, respectively, to

which are similarly secured annular sprocket Wheels 2| and32,respectively, it being here noted 7 that the axis of the annular journalI3 is disposed below the axis of the mixing shell, while the axis of theannular journal 20 is disposed above the axis of the mixing shell for apurpose hereinafter set forth. The journals with their correlatedsprockets are also disposed in spaced relation to their respective endsof the shell H by a series of spacers or bosses 24, which are ofdifferent lengths, so that such journals and their sprockets aremaintained in parallel relation with respect to each other and inperpen- Y dicular relation to the axis of rotation of the shell II. Thejournals l9 and 20-are cradled or supported for rotation upon rollers'25 mounted ,upon a supplemental frame 21, which is provided with aseries of rollers 29 operating in channel guides 30 secured to a truckframe 32. Rigidly secured to one side of the supplemental frame 21 is arack 33, with which meshes a pinion 34 journalled upon the truck frame32 for rotation by a crank handle 35. Obviously, when the crank 35 isturned in a clockwise direction the supplemental-frame'fl is movedrearwardly upon the truck frame 32, to the dumping position indicatedposition or at any intermediate point between a fully advanced or fullyretracted position, as

aoiaseo will be manifest and apparent by referring to Fig. 1, so thatthe supplemental frame 21 '.may be locked to the truck frame 32 duringmixing operations, or if for any reason may be locked to the latter inany intermediate position between the "mixing position and dumpingposition.

'The sprocket wheels 2i and 22 are connected by sprocket chains 40 tosprocket pinions 4|,

which latter may be driven in any convenient manner. In the presentinstance, however, I have shown a shaft 43 adapted to be optionallyengaged with -a driving shaft 66 of any standard type of-power take-off.A bevel pinion 45 and a bevelgear B6 transfer the power from the shaft43 to. diiferential gearing 43, which in turn imparts power tojack-shafts 50 and i, to the outer ends of which are rigidly secured thesprocket pinions 5i. By interposing the differential gearing 48 betweenthe sprocket pinions Bi and the versely disposed frame 52 rigidlysecured to the forward end of the supplemental frame 21, substantiallyin the manner illustrated in Figs. 1 and 3.

A hand brake 53, of any standard type, mounted upon the jack-shaft 50and attached as at 55, in any well known manner to the frame 52, isprovided for the purpose of positively holding the mixing shell II inposition during dumping operations.

Longitudinally disposed water storage tanks 55 are mounted upon thesupplemental frame 27 in spaced relation to the ends of the mixing shellH, as shown more clearly in Fig. 2, said tanks 55-being interconnectedby a common discharge pipe or conduit 56, which extends longitudinallythrough the mixing shell II and is provided with a series of alignedapertures 51 spaced at intervals throughout its length. Mounted foroscillative movement upon the discharge pipe 56 is an oscillative sleeveor valve pipe 58 having a series of aligned apertures 59, which registerupon occasion with the apertures 51 of the pipe 56. It will be noted byreferring to Fig. 2 that the axes of the pipes 56 and 58 areco-extensive with the axis of rotation of the mixing shell II and inconsequence thereof, such pipes are not affected by the rotation of saidshell.

To reinforce the interior of the mixing shell II I have found itdesirable in some instances to provide a series of tie rods 6i,,whichare rigidly secured at their terminals to the opposing flat sides of thesaid shell, or to one fiat side and the opposing angles of the same,substantially in the manner indicated diagrammatically in Fig. 4. Theserods are disposed or distributed instaggered relation throughout. thelength of the mixing shell and function to stiffen the flat sidesthereofand break up any lumps of dry aggregatestthat tend to float in the mix.

Where it is necessary to transport .and'mix a large quantity ofaggregates I have found it desirable and essential to slightly modifythe mixer, substantially in the manner illustratedin Figs. 5 to 8,inclusive. In this type the mixing shell Ila having a side door l2a atone end thereof is longitudinally disposed uponits correlated truck,thus making it possible to have a mixing shell of considerable lengthand capacity. This 101m of construction requires a tilting correlatedparts may be cradled upon a laterally tilting supplemental frame 10pivotally condisposed upon and rigidly secured to the truck frame 32. Inthis connection it is to be noted that the supplemental frame 10is-superimposed upon the intermediate frame 13, as shown in Fig. 6,while the supplemental frame Illa is disposed in the same horizontalplane with the intermediate frame 13a, as is shown in Fig. 7, dependingupon the individual or particular design of its correlated truckchassis,

. While any convenient hoisting means may be employed to effect lateraltilting of the supplemental frames 10 or 10a, actual experience hasdemonstrated that a multiple lift hydraulic jack 14 manually operable byan actuating handle 15 to be very efficient and reliable for thispurpose, the base of said jack being pivotally secured to thetruck frame32, while the upper lift member of the jack is pivotally connected andsecured to the supplemental frame 18 or 18a, as indicated at 18 in Fig.6 or at 16a in Fig. 8.

When the mixing shell lla and the supplemental frame 78 are fullyelevated or tilted by the jack It to the dumping position indicated bythe dotted lines in Fig. 6, gravity tends to roll or unseat the shell Ila from its supporting rollers 28a, and in order to effectually andpositively prevent unseating of the shell I provide a roller 18 for eachend of the latter, which rollers are mounted upon bearings 19 rigidlysecured upon the ends of the supplemental frame 10 between thesupporting rollers 25a, substantially in the manner illustrated in Fig.6, and are adapted and designed to engage and roll within the innersurfaces of the annular journals |9a and 28a, so that during tiltingmovements of the shell II a and frame 18 by the jack 14, such shell ismaintained at all times by the rollers 78 in cradled relation within itscorrelated supporting rollers 25a, as will be manifest and apparent. Thejack 14 also functions as a stop to limit the tilting movement of theframe 78 and thus prevents the weight of the shell and the aggregatesfrom overturning said frame, the supplemental frame 18a is also equippedin a similar manner, as above described for the frame 18, so that whenthe same is tilted as illustrated in Fig. 8, its correlated mixer Ilawill not become unseated.

In both forms of transit mixers, hereinbefore shown and described, it isdesirable to control the supply of water to the mixing shells or i lafrom the driver's seat, and in the transversely disposed type of mixingshell shown in Figs. 1 to 3, inclusive, the numeral 80 designates acontrol rod, which extends rearwardly from the operator's cab, notshown, and at its rear end is connected to one arm of a bell crank lever8| pivotally mounted upon the truck frame 32, the other arm of whichengages or abuts the lower end of a push rod 82 pivotally connected atits opposite or upper end to an oscillative arm 83 rigidly secured toone end of the oscillative sleeve or valve pipe 58, whereby a pull uponthe control rod 88 exerts an upward thrust upon the push rod 82 and itscorrelated arm 83, causing circumferential movement of the sleeve 58upon the pipe 56, so that the apertures 59 are brought into means,consequently, the mixing shell with its registration with the apertures51 to spray the aggregates with the necessary quantity of water duringmixing operations. Upon retraction of the control rod 88 a tension'spring 84 connected at one end to the periphery of the sleeve 58 and atits other end to the water tank 55 serves and functions thereat toeffect reverse circumferential movement of the sleeve 58 and thus movethe apertures 59 out of registration with the apertures 51, therebyshutting off the water. When the supplemental frame 21 is movedrearwardly to dump the load the lower end of the push rod '82 slides offthe bell crank 8|, but upon return of the frame 21 to a normal or mixingposition the pushrod 82 is again brought into engagement or abutmentwith the bell crank 8| it will therefore be apparent that by fabricatingthese parts in the manner herein shown and described, that suchconstruction readily permits of independent movement of the supplementalframe 21 and its correlated parts relative to the control rod 80 and itsbell crank 8|;

In the longitudinally disposed type of transit mixer disclosed in Fig. 7a cable 85 extends rearwardly from the operators cab, not shown, throughthe pivot pins Ila around suitably disposed pulleys 85' and thenceupwardly therefrom to the operating handle of a water control valve 86connected to the outlet of a water storage tank 55a. A tension spring8'! functions to normally close the valve 86 and retract the cable 85.

In some instances and under certain conditions it is desirable to dumpthe mixed aggregates at some distance from the truck, and for thispurpose I employ a chute 90 illustrated in Figs. 7 and 8, which chutemay be effectively employed with either the end or side dumping type ofmixer. The chute 98 is fabricated in any desired length and at its upperor inner end has a width equal to the door l2a, whcrefrom it convergesoutwardly and downwardly in the manner shown in Fig. 7,

said chute being preferably supported or suspended by rapidly andreadily detachable means,

such as chains 9|, to a bar or rod 92 mounted for pivotal movement, at apoint substantially midway its length, upon a pin 93 secured to alongitudinally disposed member 94 fixedly mount-- ed upon one side ofthe supplemental frame 10. This method of mounting the chute 9!] permitsturning the same in any direction to thereby facilitate and expeditedumping of the concrete in the desired location. a

In operation a transit mixer of either the end or side dump type,hereinbefore described, is positioned under a batching chute with itsdoor l2 or |2a open and uppermost, this permits of rapid and readycharging of the mixing shell II or Ila with the desired quantity andproportion of aggregates, following which the door l2 or IM- is closedand clamped. The water storage tanks 55 or 55:; are then filled and thetransit mixer started for its destination. At a proper distance from itspoint of delivery the shafts 43 and 44 are interconnected by the clutchmechanism disclosed in Fig. 3, or by any other convenient and suitablemeans, to thereby impart rotative and wobbling movement to the mixingshell I or I la and the necessary quantity of water is sprayed upon theaggregates. As the. mixing shell II or I la rotates and wobbles the flatsides of the same function due to rotative movement to carry theaggregates on the bottom upwardly and dump or slump such aggregates uponand into the upper aggregates, and coincidentally and concurrentlytherewith the endwise wobbling movement of such shell produced by theeccentrically in combination with the rotative movement of theparticular shell causes slumping of the aggreapparent. To facilitate andexpedite a complete gates from the ends of such shell to the center ofsame, whereby the entire charge of aggregates in the shell II or a arethoroughly and intimately intermixed. Obviously, therefore, the combinedrotative and wobbling movements of the shell II or IIa produces athorough intermixture of the aggregatesboth in lateral and longitudinaldirections.

In the end dump type of transit mixer, when it is desired to dump themix, the rotating mixing shell I I is stopped with the door I2 in thedumping position, substantially as indicated in Fig. 1, by applying thebrake 53 which also functions to positively hold the shell in suchposition during dumping, whereupon the shafts 43 and M are disconnected,the movable supplemental frame 21 carrying the mixing shell andcorrelated parts is then moved rearwardly, from the full line positionto the dotted line position shown in Fig. 1.

' secured, and due to the elimination of all bailie plates nothing willstick to the inner surfaces of the shell to cause corrosion. However, ifit is desired to discharge only a small amount of the intermixedaggregates, the small or auxiliary door I6 is utilized for this purpose,and being mounted upon the large door I2 will operate from the samedumping position.

Actual experience has shown and demonstrated the advisability andnecessity of locating the mixing shell II somewhat forwardly of the rearwheels of the truck, during loading and mixing operations, which factnecessitates the rearward movement of such shell for'dumping, and inthis connection it may be well to state that any tendency for the mixingshell II and its correlated movable supplemental frame 21 to overbalancewhile in a rearward or dumping position is effectually and definitelyprevented by the supplemental frame rollers 29 abutting the upper sidesof their guide channels 30 rigidly secured to the truck frame 32. v

In the side dump type of transit mixer, the side door In is hinged as atI3a and is secured in a closed position by latches I 40, and when it isdesired to dump the mix, the mixing shell is stopped and held in theposition indicated in full lines in Fig. '1, following which the chute90 is attached with its inner end disposed contiguous to the door I2a,which is-then opened .to discharge the major portion of the mixedaggregates into the chute 90, however, to eflect complete discharge ofthe contents of the shell, the jack" is actuated to elevatethesupplemental frame or 10a with its mixing shell Ila, whereby the slopeor angularity of the lowermost flat wall of the shell is increasedresulting in the entire evacuation of the latter, as will be manifestand and clean discharge of themixing shell Ila, particularly where thedoor I2a occupies only a portion of one of the fiat sides'of said shell,

as shown in Fig. 7, I have found it expedient in practice to locate therear pivot pin 1Ia adjacent the chute 90 in a plane below that of theforward pivot pin 1Ia, which form of construction perposed mixingshell,hexagonal in cross-section,

and especially designed for end dumping, said shell having eccentricallymounted raceways IOI rigidly secured upon the ends thereof for rotationupon rollers I02 mounted upon the ends of a similarly disposedsupplemental frame I03, which latter is tiltably mounted at its rear endupon the rear end of a truck chassis I04, whereby the mixing shell I00and supplemental frame I03 may be tilted to the dumping position shownin Fig. 9. Movement into dumping position is effected in any suitablemanner, and I have herein shown a cable I05 which may be connected toany suitable vertical hoist, not shown, in a manner common in the dumptruck art. The pivot connection betweenthe supplemental frame I03 andtruck chassis I00 may be of any type found suitable in the dump truckart, but, in the present instance the frame I03 is provided withdepending brackets I06 and the chassis I04 is provided -with rearwardlyextending brackets I01 having laterally extending gudgeons I08 which arejournalled for oscillative movement within the lower ends of thedepending'brackets I06, as shown more clearly in Figs. 10, 11' and 12,the pivotal mounting herein shown and described is merely illustrativeas any pivotal mounting may be employed which is found suitable.

A longitudinally disposed shaft I09 connected at its forward end to anystandard type of power take-off, not shown, is journalled at its rearend within an extension IIO of one of the brackets I01, whereat it isinterconnected by bevel gearing I I I to a laterally disposed shaft I I2journalled for rotation at its inner end within the extension H0 and atits outer end is journalled within and extends through the adjacentbracket I01 and gudgeon I08. Fixedly secured to the outer' terminal ofthe shaft H2 is a sprocket wheel II3 connected by a sprocket chain II Ito a sprocket wheel H5 having a bevel pinion IIG formedintegraltherewith, or otherwise rigidly secured thereto, said sprocket wheel II5 and bevel pinion I I6 being fixedly secured to a stub shaft II Ijournalled for rotation within an extension IIB, .of the adjacentbracket I01.

Meshing with the bevel pinion us is a bevel gear H9 which is fixedlysecured upon the rear terminal of a shaft I20 longitudinally disposedupon one side of the supplemental frame I03 and journalled for rotationadjacent its ends within brackets IZI fixedly secured to the side ofsaid ing rollers I02 with truncated conical faces I25 which normallyabut and roll upon a bevelled por- -III tion or face I26 formed integralwith or otherwise rigidly secured to the rear annular sprocket wheelI24, substantially in the manner illustrated in Fig. 9. Further, tosimilarly prevent unseating of the forward end of the shell I from itsfront supporting rollers I02 I provide a roller I21 which is mountedupon the front end of the supplemental frame I03 and is adapted toengage and roll upon the inner surface of the front raceway "II, whichin the present instance is of annular formation, and identical inconstruction to the raceways I9 and 20 hereinbefore described, while therear raceway IOI in the present instance, is fabricated in the form of acylindrical throat having a coned outer end I28 provided with adischarge aperture I29 adapted to be closed by a door I30 during mixingoperations.

To prevent lodgement of the mixed aggregates I00 withthe aggregates isprovided in one of the flat sides thereof, said opening being normallyclosed by a door I33 slidably mounted in guides I34 formed upon saidshell.

A water storage tank I35 is laterally disposed and suitably supportedupon the forward end of the supplemental frame I03 with its outletconnected to the suction side of a rotary pump I36. which is alsomounted upon said frame with its axis in alignment with the axis of theshaft I20. A pipe I3'I connected at one end to the discharge of the pumpI36 extends upwardly therefrom and at its upper end projects within themixing shell I00 and is provided thcreat with a nozzle I38. said upperend being adapted to pass through the axis of rotation of said shell andin consequence is not affected by the rot-ative movements of the same. Aclutch I39 is provided to interconnect the shaft I20 with the pump I36to drive the latter whereby the necessary quantity of water is sprayedupon the aggregates during mixing operations.

In operation the herein described transit mixer is placed under abatching chute with the mixing shell I00 in a horizontal disposedposition with its charging door I33 open and uppermost and its dumpingdoor I30 closed. Upon charging the shell I00 with the desired quantityof aggregates the door I33 is closed and the water tank I35 filled,following which the transit mixer is started for its point of delivery.Upon nearing suchi point the operator connects the shaft I09 with thepower plant of the truck, to thereby impart rotative movement to themixing shell I00, through the media of the bevel and sprocket gearmechanism hereinbefore described, which rotative movement also causesend to end wobbling movement of the shell due to its eccentric mounting,the operator then connects the shaft I20 with the pump I36 through themedium of the clutch I39 to spray the necessary quantity of water uponthe aggregates. The action produced upon the aggregates by the aforesaidrotative and wobbling movements is identical to that described for theshell II, and upon the point of delivery being reached and aftercompletion of the mixing operation the supplemental frame I03 and itscorrelated mixing shell I00 is tilted to the dumping position shown inFig. 9, whereupon the door I30 is opened and the mixed aggregates dumpedout. It is to be here noted that the mode of construction of the transitmixer above described readily permits of the rotation of the mixingshell I00 in a dumping position, or in a position of rest, or in anyintermediate position.

In the foregoing description and in the accompanying drawings I haveelectedto describe and illustrate the mixing shells as being hexagonalin cross-section, but, it is to' be understood that such shells maybefabricated with any number of fiat sides. It is therefore the primaryand principal feature of this invention to provide an eccentricallymounted mixing shell, which is polygonal in cross-section, wherebyrotation of such shell will produce a slumping action oL-tfle aggregatesin a crosswise direction due to the flat sides and the eccentricmounting of the shell will cause the same to wobble and produce aslumping action of the aggregates from the ends of the shell to thecenter of the same. It will thus be readily apparent and obvious that athorough intermixture of the aggregates is secured with- --.out the aidof baliie plates or any other similar obstructions upon the interiorwalls of the mixing shell.

While I have herein shown and described the invention with sufiicientdetail to enable those skilled in the art to which it pertains tounderstand the mode of construction and the principles involved, it isto be understood that there is no intentional limitation herein to thespecific form and precise details of construction shown and described,except as expressly defined by the appended claims, and that variousmodifications of the same may be resorted to without departing from thespirit of the invention or the benefits derivable therefrom. It is alsoto be understood that certain features of the invention herein disclosedmay be employed in and with other combinations than those shown anddescribed.

What I claim as my invention and desire to secure by Letters Patent is:

1. In combination with a concrete mixer, of an axially elongatedeccentrically mounted voluble mixing shell-having closed ends and apolygonal cross-section, one of the sides of said shell forming a doortherefor. an auxiliary door on said first mentioned door, and means forrotating the shell.

2. In combination with a motor truck having a drivers cab, a tiltableframe mounted on the truck, a concrete mixer on the tiltable frame, awater tank and piping therefrom to the mixer and a pump interposed inthe piping all carried on said tiltable frame, transmission foroperating the mixer from the truck power, a shaft operated by theoperation of the mixer. and a clutch for connecting said pump to saidshaft.

3. In combination with a motor truck having a driver's cab. a tiltableframe mounted on the truck, a concrete mixer on the tiltable frame, a 1

water tank and piping therefrom to the mixer and a pump interposed inthe piping all carried on said tiltable frame, transmission foroperating the mixer from the truck power, a shaft operated by theoperation of the mixer. and a clutch for connecting said pump to saidshaft'operable from the driver's cab whereby the pump may be engagedwith the shaft or disengaged during the transit of the truck.

HUGH P. PARIS.

